import 'user.dart'; class Message { String idSender; String idReceiver; String content; Message({required this.idSender, required this.idReceiver, required this.content }); Map toHashMap() { return { 'idSender': idSender, 'idReceiver': idReceiver, 'content': content, }; } factory Message.fromMap(Map data){ return Message( idSender: data['idSender'], idReceiver: data['idReceiver'], content: data['content'], ); } }